I'm just at the transition from DSLR in to the world of mirror less. I shoot professionally, so quality does count and I'm happy to pay more for decent lenses if there are good reasons, knowing that they usually outlast bodies by some considerable margin of time. So, if starting from scratch and assuming budget is not the major consideration for a moment (let's just assume both lenses in the pair were the same price) and assuming AF was a requirement, would you buy: • The Olympus 12mm f2.0 or ???? • The PL15 f1.7 over the Olympus 17 f1.8 ? • The PL25 f1.4 over the Olympus 25mm f1.8 ? • The PL42.5 f1.2 over the Olympus 45mm f1.8 ? • The Olympus 75m f1.8 or what else? Again, assume each of the lenses in the appropriate pair were actually the same price... I've read lots of reviews and many people seem to be biased to one system or the other, usually based on what they have in front of them. Maybe they are trying to justify their own purchase, but not many people seem unhappy with what ever they had.